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Dragonflies are the mortal enemy for mosquitoes and in flight
they generate sound frequencies (approximately) between 67 Hz and 45
Hz, depending on their sizes.

56 Hz is a good average number in between those frequencies. Your
PC sound card and speakers will work well for this purpose. There
are many sound and tone generator programs available on the internet
for both the Mac and Windows PC. If you do not have a sound
generator program, you can download a free version for Windows
HERE.

Setup your computer with the sound/tone generator program running
and then play the sound through your computer speakers. The speakers
can be aimed directionally for complete room coverage.

The sound level on the speakers should be adjusted so it is
barely audible. This arrangement can be setup in a bedroom where you
would like to have the window open but are worried about mosquitoes.
One speaker should be fairly close to where you are sleeping.

Here are some links to more advanced tone generator software
which can actually sweep between the 45 Hz and 67 Hz frequencies:

This same setup can also be used with various advanced frequency
generators such as the GB-4000 or an EMEM Ray Tube device. Instead
of using computer software, just program the chosen frequencies into
your frequency generator and run them in the desired area. Many
users report that this setup will keep mosquitoes away in an area of
over 60 feet from the generator.